先加密，然后再解密怎么出现乱码了？？

Question

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;using System.Security.Cryptography;
namespace WebApplication1
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           EncryptData(Server.MapPath("~/inFile.txt"), Server.MapPath("~/outFile.txt"), "yuna1234");
           DecryptData(Server.MapPath("~/outFile.txt"), Server.MapPath("~/outFile22222.txt"), "yuna1234");
            
        }
        // DES加密过程
        public void EncryptData(string sourceFile, string destinationFile, string cryptoKey)
        {
            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
            desProvider.Key = ASCIIEncoding.ASCII.GetBytes(cryptoKey);
            desProvider.GenerateIV();
            ICryptoTransform desEnctypt = desProvider.CreateEncryptor();            FileStream inFileStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read);
            FileStream outFileStream = new FileStream(destinationFile, FileMode.Create, FileAccess.Write);            CryptoStream cryptoStream = new CryptoStream(outFileStream, desEnctypt, CryptoStreamMode.Write);            byte[] byteArrayInput = new byte[inFileStream.Length-1];
            inFileStream.Read(byteArrayInput, 0, byteArrayInput.Length);            cryptoStream.Write(byteArrayInput, 0, byteArrayInput.Length);            cryptoStream.Close();
            inFileStream.Close();
            outFileStream.Close();        }
        // DES解密过程
        public void DecryptData(string sourceFile, string destinationFile, string cryptoKey)
        {
            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
            desProvider.Key = ASCIIEncoding.ASCII.GetBytes(cryptoKey);
            desProvider.GenerateIV();            ICryptoTransform desEnctypt = desProvider.CreateDecryptor();
            
            FileStream decrptedFile = new FileStream(sourceFile, FileMode.Open, FileAccess.Read);            CryptoStream cryptoStream = new CryptoStream(decrptedFile, desEnctypt, CryptoStreamMode.Read);            StreamWriter decryptedOutput = new StreamWriter(destinationFile);
            
            decryptedOutput.Write(new StreamReader(cryptoStream).ReadToEnd());
            decryptedOutput.Flush();
            decryptedOutput.Close();
            cryptoStream.Close();
            decrptedFile.Close();
        }
    }
}

Answer 1

于娜 也是.net的 嘿嘿~
不过真小气哈才10分。
desProvider.Key = ASCIIEncoding.ASCII.GetBytes(cryptoKey); 
改为这样  试下
 System.Text.ASCIIEncoding.UTF8.GetBytes(cryptoKey);

Answer 2

我这有关于加密与解密的方法  你用这个吧很好用。    private  byte[] DESKey = new byte[] { 11, 23, 93, 102, 72, 41, 18, 12 };
    private  byte[] DESIV = new byte[] { 75, 158, 46, 97, 78, 57, 17, 36 };   
    //加密函數:  
    public string Encode(string Encode_String)
    {
        DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
        MemoryStream objMemoryStream = new MemoryStream();
        CryptoStream objCryptoStream = new CryptoStream
            (objMemoryStream, objDES.CreateEncryptor(DESKey, DESIV), CryptoStreamMode.Write);
        StreamWriter objStreamWriter = new StreamWriter(objCryptoStream);
        objStreamWriter.Write(Encode_String);
        objStreamWriter.Flush();
        objCryptoStream.FlushFinalBlock();
        objMemoryStream.Flush();
        return Convert.ToBase64String(objMemoryStream.GetBuffer(), 0, (int)
              objMemoryStream.Length);
    }    private byte[] DESKey = new byte[] { 11, 23, 93, 102, 72, 41, 18, 12 };
    private byte[] DESIV = new byte[] { 75, 158, 46, 97, 78, 57, 17, 36 };    //解密函數  
    public string Decode(string Encode_String)
    {
        DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
        byte[] Input = Convert.FromBase64String(Encode_String);
        MemoryStream objMemoryStream = new MemoryStream(Input);
        CryptoStream objCryptoStream = new CryptoStream
              (objMemoryStream, objDES.CreateDecryptor(DESKey, DESIV), CryptoStreamMode.Read);
        StreamReader objStreamReader = new StreamReader(objCryptoStream);
        return objStreamReader.ReadToEnd();
    }  

Answer 3

更简单的。
加密
SELECT EncryptByPassPhrase(N'这是密码,用来加密的','这是要加密的内容')
解密 
SELECT CONVERT(NVARCHAR(50),DECRYPTBYPASSPHRASE(N'这是密码,用来加密的',字段))